Traction unit



FIG. 1 is a perspective view of my design;

FIG. 2 is a top plan view of the design of FIG. 1;

FIG. 3 is a left side elevational view of FIG. 1;

FIG. 4 is a front elevational view;

FIG. 5 is a right side elevational view; and,

FIG. 6 is a rear elevational view. 

The ornamental design for a traction unit, as shown and described. 